ElectricPavlov

' Welkkome '   

Answer "C"

9.95 + 8.01 p   <=50

8.01 p <= 40.05

p <= 5

Answer 'A'

44+2n <= 80

2n>= 36

n>= 18

THAT is a really BIG quarter !     2.4 inches in diameter....

Very similar...only slightly different numbers here:

https://web2.0calc.com/questions/hard-rate-question-help#r2

See if you can figure this problem using the same methods.....post back here is you need more help....

*** edited ***    Fixed typo    answer is the same

....because from Vieta     R1 R2  =   c / a  

R1 R2 = c / ( 1/2)  = 2c

R1R2 / 2 = c  

(-99 + sqrt (8201) (-99 + sqrt (8201) / 2  =  ( 99^2 - 8201 ) / 2 = 890

From CPhill answer :

     x^2  + ( 2 + k)x  + 28     

    the roots are the same    R1 = R2 

       From Vieta                   

          R1R1 = 28              so   R1 = +- sqrt 28

                     and        -  ( R1 + R1) /a  =      -R1 - R1  =  2 + k                   (a = 1 in this case)

                                                                    - 2R1 = 2+k

                                                                      - 2(+- sqrt28) - 2   = k

                                                                        - 4 sqrt7  -2 = k    and  4 sqrt 28 -2 = k        summed = -4

                                                                                                                      (as Chris found via different method)

Cos rule

v^2 = x^2 + w^2 - 2 x w cos (103)     

     v^2 = 26^2 + 55^2 - 2 (26)(55) cos 103     <========   Finish from here ......

one.

....building on this great answer     there are    4 * 3 * 2 possibles = 24

5731

5713

5173

5137

7531

7513

etc .....